Lawn mower



J. J. BOYD LAWN MOWER Aug. 8, 1950 3 Sheets-Sheet 1 Filed Feb. 16, 1948J Jbhn Jfio df I Filed Feb, 16, 1948 s Sheets-Sheet 2 u 8, 1950 J. J.BOYD 2,517,834

' LAWN MOWER 5 2,] woe/W101; Jbkll J. 303mb,

Aug. 8, 1950 J. J. BOYD 2,517,834

LAWN MOWER Filed Feb. 16, 1948 3 Sheets-Sheet 5 Patented Aug. 8, 1950 5435 TATES I PAT C ,l, l 7 3 t p .u IiAWNMOWEIt i 1 1 f QYd 9 M i l v i ItQ r v Application February 16,1948, Serial No. 8,578

' s-o ims," (o1, 5 -25;)

This invention is a mowing machine and has Fig. daisan edge .View of theblade asshown particularreference to lawn mowers. in Fig. 3, I

The primary object of the invention is to pro- .Fig. 5 is a view.similar to Fig. 3 and illustrating vide a mowing machine .of suchconstruction as a faceview of one of the movable cutter members,- toobviate the possibility of foreign material be- 5 Fig. 6 .is an edgeview of the blade shown in coming engaged with the reel of the machineand Fig. 5, and r 1 i H to prevent clogging orjam'ming of the reel or,to Fig. 7 is a view of; one end of a conventional impair its operation.form of lawn mower, reel and illustrating the A further object of theinvention is to procutting elements as applied thereto. vide a mowingmachine of that type characterized 10 Referring now more particularly tothe drawby a power driven reel, so constructed and aring, the mowingmachine here disclosed for the ranged as to clear the bearings of thereel of purposes of illustratingthe invention embodies grass, weeds,roots or other such material autoside qfrarne members it) connected at,theirformatically as the machine advances in its cutting Ward'ends by atransversely disposed shaft l I,

to the ends of, which theground engaging or sup- Operations.

A further object of the invention is to provide porting wheels i2 aresecured, The mowing a mowing machine of that type employing the chinehere disclosed is of that type employing a usual power driven reel, andwherein cutting elemotor for the purpose of driving the machine as mentsare provided adjacent to the bearings of well as the-movable partsthereof. For the purthe reel so as to cut grass, weeds, roots or otherposes of clarity, the motor is omitted, but it will such material priorto the time such materials 7 be understqodthat power from such source tocome in contact with the bearings, in order that p p t e machine isapplied to the no the-bearings may be kept free and clear of any groundin Wheels l2 y mea s of V the such material as might tend to clog orimpair the sprocket I3, while the cutting reel, represented bearing, andfurther characterized by improved generally at 14, is rotated throughthe instrumeans for insuring at all times proper shearing mentality ofthe sprocket I5 secured to the trun; action of the cutting elements.nion orreel shaft I6. The rear endofthe frame A further object of theinvention is to provide I0 is Supp ted by the roller 'h the frame amowing machine of the character and for the y steered by the p 18 in theel a purposes generally stated which is of simple conher, The blades I9of the reel l4 coactwiththe struction, which involves but few simple andfixed cutterbar or blade 20 as the mowing mareadily assembled parts,which parts are so convehine advances and in a manner We understood.structed and coordinated as to minimize the op- The machine e disclosedfor he pu p s portunity for wear, breakage or derangement, ofillustrating the invention is referredt o as a which parts may bereadily assembled upon mowpower driven machine, but it will beunderstood ing' machines generally and without material that t e t o mayequally as well be emchange in'the-construction of such machines, and ly in Connection, W h mowing machines of 'with others which will appearas the description which will prove highly practical and efiicient forthat type which are p ed by e her pushing the purposes intended. orpullin 'With the foregoing objects in view, together 40 The r el l4isprovided at each end. with a spider 2| to which the blades [9are'se'cured, proceeds,-the invention consists in the novel cond cSpider has an outwardly projectin struction, combination and arrangementof parts, end trunnion 2 retatably ga eda d all as will be describedmore fully hereinafter, npported in a bearing 23 rigidly secured to theillustrated in the drawings, and particularly m fl em in Of the machineehaSSiS- t t in t e l i Each of the bearings 23 has secured to and In tdrawing: radiating therefrom fixed cutter blades 24, said Fig. 1 is atop plan view, parts broken away, of blades being held rigid with thebearing mema mowing machine and. illustrating as applied hers by means fp s r rivets 5 xtendin thereto a, bearing clearing mechanism involvingthrough bosses 26 carried by the bearings. While the invention, thereare three blades shown in the present in- Fig. 2 is a transversesectional view taken sub- Stance, it will be understood that more orless stantially upon line 2-2 of Fig. 1, of such blades may be used ifdesired. It will Fig. 3 is an enlarged front elevation of a fixed beobserved that the blades 24 are located at the blade to be used inconnection with the mowing inner end of the hearing, or at that end ofthe machine, bearing next adjacent to the reel end.

Each of the shaft ends or trunnions 22 has rotatably mounted thereon aplate 21 to which is secured a plurality of radially disposed cutterblades 28, secured to the plate by means of pins or rivets 29. Theblades 28 carried by the plate 21 correspond in number and inapproximate size with the blades 24 affixed to the bearing, and thecutting edges of the blades 28-24 are arranged in shearing relationship.An expansion spring 38 encircles the trunnion or shaft end 22 at eachend of the reel and bears at one end against the adjacent spider 21, theopposite end of each spring engaging its corresponding plate 21. Thesesprings exert tension against the plates 21 so as to maintain the blades28 in proper shearing relationship with the fixed blades 24.

Each of the plates 27 has projecting inwardly therefrom and inparallelism with shaft 22 a pin 3|, said pins extending through openings32 in the adjacent spider 2|.

In operation, as the mowing machine advances, the reel is rotated in themanner described, bringing about a cutting action between the blades IQof the reel and the fixed blade 20 supported by the machine frame. Anyupstanding grass, weeds, roots or other material which might ordinarilybecome wrapped around or engaged with the trunnions or shaft ends 22 atthe bearings 23 will be caught between the fixed blades 24 and therotating'blades 28 and will thus be severed. It will be noted that thelocation of these cooperating cutting elements is at the inner end ofthe bearing 23 where ordinarily clogging or obstructing materialsaccumulate to impair if not damage the machine. In the manner described,all danger of the reel bearings becoming clogged with foreign materialsis overcome by the location of the fixed and movable blades operatin inthe manner described. The tension of the spring 38 is such as to at alltimes insure proper shearing action between the blades, and the pin 3iis the instrumentality through which driving power is imparted to therotating blades.

It is apparent that a machine constructed in the manner described willat all times have its reel bearings protected against the ingress offoreign matter which might tend to impair or interfere with the properoperation of the cutter reel.

I claim:

1; In a bearing clearer for a mowing machine, a frame, a power reelcarried by said frame, bearings in said frame to support said reel,blades affixed to said bearings in close proximity to the ends of saidreel and radiating from said bearings, cutter blades carried by saidreel, and means maintainin said cutter blades in shearing relationshipwith said fixed blades.

2. In a bearing clearer for a mowing machine, a frame, a power reelcarried by said frame,

bearings in said frame to support said reel, fixed blades carried bysaid frame in close proximity 4 to the ends of said reel and radiatingfrom said bearings, a plate carried at each end of said reel, shearblades aflixed to said plates and radiating therefrom, means on saidreel to force said plates with their blades in shearing relationshipwith said fixed blades, and a drive connection between said reel andsaid plates.

3. In abearing clearer for a mowing machine, a frame, a power reelcarried by said frame, hearings in said frame to support said reel,

.blades amxed to said bearings and radiating therefrom, a plate at eachend of said reel, blades affixed to said plate and radiating therefrom,a spring on each end of said reel engaging said plates and maintainingthe blades thereof in shearing relationship with the said fixed blades,said blades disposed in close proximity to said bearings and the ends ofsaid reel and a power connection between the reel and each of saidplates.

4. In a bearing clearer for a mowing machine, a frame, bearings arrangedin spaced relationship upon said i'rame, a reel within said frame,shafts projecting from the ends of said reel and rotatably engaged insaid bearings, fixed blades secured to said bearings and radiatingtherefrom, said blades disposed in close proximity to said bearingsandthe ends of said reel, a plate freely mounted on each of said reel shaftends, shear blades radiating from said plates, a spring on each shaftend encircling the latter and bearing at one end against an adjacentplate, the other opposite ends of said springs engaged with said reel,and a pin on each plate connected to the adjacent ends of said reel.

5. In a bearing clearer for a mowing machine, a frame, a power reel, ashaft for said reel, bearings in said frame to support said shaft, afixed blade secured to said frame in close proximity to said bearing andradiating therefrom, a plate rotatably carried by said shaft, shearblades affixed to said plate and radiating therefrom, a spring carriedby said reel and exerting pressure upon said plate to force the bladesthereof into shearing engagement with said fixed blades, and a driveconnection between said reel and said plate.

JOHN J. BOYD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UN I'I'ED STATES PATENTS Great Britain July 20, 1908

